Exacum


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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Exacum

 

a genus of annual or perennial herbaceous plants of the family Gentianaceae. The flowers are white, lilac, dark blue, or purple-violet; the inflorescence is a panicle. The fruit is a two- valved globose capsule. There are about 35 mainly tropical species, growing in India, East Asia, the Malay Archipelago, and the island of Socotra. Some ornamental species are raised in conservatories. Popular ornamentals include E. affine, which has numerous lilac flowers with yellow anthers, and E. zeylanicum, which has large azure flowers.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
In Gentianaceae the buzz-pollinated Exacum and Orphium have a curved androecium and gynoecium (Klackenberg, 2002); in Exacum dipterum also the calyx is monosymmetric (Klackenberg, 2002).
Plant family and species Resource Centris Centris collected nitida errans Acanthacease Suessenguthia multisetosa Nectar X Fabaceae Bauhinia blakeana Nectar X Chamaecrista keyensis (1) Pollen X Parkinsonia aculeata Pollen X Senna alata Pollen X Senna ligustrina Pollen X Senna mexicana Pollen X Senna pendula Pollen X Gentianaceae Exacum affine Pollen X Lythraceae Cuphea sp.
Androecium: stamens 4-5(-12), isomerous, alternipetalous, sometimes strongly zygomorphic and adnate to corolla tube or mouth, rarely some staminodal or even obsolete (Hoppea): anthers tetrasporangiate, usually introrse (extrorse in Gentiana) and dithecal; dehiscing via a longitudinal slit or rarely by terminal pores (Exacum); occasionally connate (Voyria); occasionally connective with one to two apical glands (Sebaea); rarely with long thread-like projections (Urogentias).